class Animal17{
    public void shout(){
        System.out.println("喵喵喵········");
    }
}
class Dog17 extends Animal17{
    public void shout(){
        System.out.println("汪汪汪········");
    }
    public void eat(){
        System.out.println("吃骨头·······");
    }
}


public class Example17 {
    public static void main(String[] args) {
        Animal17 a1 = new Dog17();
        System.out.println("instanceof判断a1是否来自动物类" + (a1 instanceof Animal17));
        System.out.println("instanceof判断a1是否来自狗类" + (a1 instanceof Dog17));
        Animal17 a2 = new Animal17();
        System.out.println("instanceof判断a2是否来自动物类\" + (a2 instanceof Animal17)");
        System.out.println("instanceof判断a2是否来自狗类\" + (a2 instanceof Dog17)");
    }
}
